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Автор - Violeta14

Докажите тождество

(a+b)^2-2ab+a^2-b^2=a*2a

Ответ

Автор - StacyTheFreak
(a+b)^2 - 2ab+a^2-b^2= a^2+2ab+b^2-2ab+a^2-b^2=2a^2<br />
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